Manafold vacuum range?

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Jan 25, 2014 | 07:19 PM

Spillage

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Record Breaker

Joined: Sep 2012

Posts: 2,437

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From: S. Florida

Manifold vacuum range?

For a healthy 5.2, what manifold vacuum readings should I be seeing?
Considering mods in signature.

Idle
Acceleration (mild)
Acceleration (hard)
Cruise (65mph)
Deceleration

Thanks!

Last edited by Spillage; Jan 25, 2014 at 07:27 PM.

Jan 25, 2014 | 09:40 PM

HeyYou

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Joined: Apr 2010

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From: Clayton MI

around 20" at idle, tapering off to nuthin' at WOT. Alot depends on what you happen to be doing at the time. Engine load plays a big factor in manifold vacuum.

Jan 26, 2014 | 10:00 PM

P1NKST@FF

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Your elevation will affect vacuum as well

Jan 26, 2014 | 10:09 PM

Spillage

Thread Starter

Record Breaker

Joined: Sep 2012

Posts: 2,437

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From: S. Florida

Not much over sea level here.

20" at idle is what I'm getting.
WOT is low, but not zero (2" or 3").
And foot off the peddle deceleration pulls 25".

Jan 26, 2014 | 10:13 PM

P1NKST@FF

Professional

Joined: Dec 2011

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How old is your filter, if your still seeing vacuum at WOT she isn't breathing as deep as she could. Come to think of it with a stock air of my truck never got to zero, but my mustang with a cold air did at the time

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